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1. Add the following parameters to the log4j.properties file (stored in the <EI_HOME>/conf/ directory):

   Code Block

   # correlationAppender logsconfig for correlation logs log4j.logger.correlationCORRELATION_LOGGER=INFO, CORRELATION log4j.additivity.correlationCORRELATION_LOGGER=false # Appender config for correlation logs log4j.appender.CORRELATION=org.apache.log4j.RollingFileAppender log4j.appender.CORRELATION.MaxFileSize=10MB log4j.appender.CORRELATION.File=${carbon.home}/repository/logs/${instance.log}/correlation.log log4j.appender.CORRELATION.MaxFileSize=10MB log4j.appender.CORRELATION.layout=org.apache.log4j.PatternLayout log4j.appender.CORRELATION.Threshold=INFO log4j.appender.CORRELATION.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS}|%X{Correlation-ID}|%t|%m%n

2. Note that the maximum file size of the correlation log is set to 10MB in the above configuration. That is, when the size of the file exceeds 10MB, a new log file is created. If required, you can change this file size.

3. If required, you can change the default HTTP header (which is 'activity_id') that is used to carry the correlation ID by adding the following property to the passthru-http.properties file (stored in the <EI_HOME>/conf/ directory). Replace <correlation_id> with a value of your choice.

   Code Block
   correlation_header_name=<correlation_id>

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• If you want correlation logs to be enabled every time the server starts, add the following system property to the product start-up script (stored in the <EI_HOME>/bin/ directory) and set it to true.

  Code Block
  -DenableCorrelationLogsDEnableCorrelationLogs=true \

• Alternatively, you can pass the system property at the time of starting the server by executing the following command:

  On Linux/MacOS/CentOS	sh integrator.sh -DenableCorrelationLogsDEnableCorrelationLogs=true
  On Windows	integrator.bat -DenableCorrelationLogsDEnableCorrelationLogs=true

Now when you start the ESB server, the correlation.log file is created in the <EI_HOME>/repository/logs/ directory.

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